JP2021527144A - Synthetic solid detergent composition - Google Patents

Abstract

The present invention comprises sulfonated methyl esters of fatty acids with chain lengths of 16 to 18 carbon atoms (C16-C18), alkyl sulfosuccinates, alkyl sulfates, alkyl ether sulfates, alkyl polyglycosides, or them. A co-surfactant selected from the group consisting of a combination of, a fatty alcohol selected from the group consisting of cetyl alcohol, stearyl alcohol or cetostearyl alcohol, a saturated fatty acid, a filler, and a moisturizer (a humectant / moisturiser). With respect to a synthetic solid detergent composition, wherein the sulfonated methyl ester is present in an amount of 5% to 30% by weight based on the weight of the composition. The synthetic solid detergent composition serves as a solid agent for body cleaning, washing or dishwashing.
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Description

The present invention relates to a synthetic solid detergent (synthetic solid detergent) composition. More specifically, the present invention relates to a synthetic solid detergent composition containing a naturally occurring sulfonated methyl ester, which can be used as a solid cleaning agent for the body or a solid agent for washing.

Soap has played an important role in physical hygiene since it existed or was invented in the Mesopotamian civilization of 2500 BC. Apart from physical hygiene, soap is also used today in many household and industrial cleaning processes. In current technology, bar soaps are industrially produced by continuous saponification of triglycerides or alkali neutralization of fatty acids.

Over the last few decades, the role of soap has evolved over time and is used not only for cleansing purposes, but also for skin care purposes. Soaps are expected to produce abundant creamy foam, which provides an excellent cleansing effect. At the same time, consumers also hope that soap will provide a moisturizing or hydrating effect, prevent dry skin after cleansing, and protect the skin from harmful external effects. There is. Therefore, bar soap manufacturers are constantly looking for new ingredients that meet these growing demands and expectations from consumers.

High pH alkaline soaps available on the market, containing only fatty acid salts and optionally free fatty acids, cannot provide the expected skin care and cleansing properties. Due to their chemical harshness (high pH), they can cause irritation and cracking on the consumer's skin. Therefore, other types of bar soaps, namely combination bars and combo soaps, have been introduced into the industry to maximize the cleansing effect while minimizing irritation. Combo soap uses a combination of synthetic surfactants such as sodium cocoyl isetionate and sulfosuccinate in addition to fatty acid salts to promote mildness of the skin. Combo soaps contain fatty acid salts and are less irritating than traditional soaps, but less mild than synthetic bar detergents.

Syndet bars and synthetic detergent bars are soap-free, made from a combination of different detergents or tensioactive agents. free) A new type of solid cleansing agent (cleansing bars). Apart from impurities, synthetic bar detergents also do not contain fatty acid salts, only synthetic surfactants. Since synthetic surfactants are generally derived from naturally occurring mineral oils, vegetable oils, or animal fats, the synthetic solid detergents produced are mild and useful as solid cleansers or dermatological bars for the body. It is known that there is. In addition, synthetic detergents often have a neutral pH that prevents skin irritation.

Synthetic bar detergents available in the industry are generally made of sodium cocoyl isetionate. Due to the widespread use of sodium cocoyl isetionate in the manufacture of synthetic bar detergents, the price of this ingredient is also exorbitantly high in the industry. Many techniques exist in the art for synthetic solid detergent compositions made of sodium cocoyl isetionate. For example, US Pat. No. 5,691,287 discloses a hypoallergenic solid cleansing agent composition comprising an amount of 20% to 35% by weight of sodium cocoyl isetionate relative to the weight of the solid cleansing agent. The composition also contains fatty alcohols along with relatively small amounts of fatty acids. There is no disclosure in this document regarding the performance of solid cleansing composition in consideration of its detergency or softening effect in addition to its hypoallergenic effect. Since sodium cocoyl isetionate is used as the main component, the production cost of this solid cleansing agent is relatively high. Moreover, sodium cocoyl isetionate is also considered a mild surfactant and may not produce the desired detergency.

SME, also known as α-sulfofatty acid methyl ester or methyl ester sulfonate (MES), has been increasingly used as a surfactant in recent years. SMEs belong to the class of anionic surfactants suitable for application in various industrial applications such as laundry detergents and dishwashing detergents. SMEs are known to be biodegradable because they are derived from natural renewable resources such as palm oil and are considered environmentally friendly alternative surfactants. Due to such reproducibility, they are becoming a more attractive option for inclusion in certain synthetic detergent formulas as surfactants. Therefore, a limited number of bar soap manufacturing techniques are beginning to use SMEs instead of sodium cocoyl isetionate as the main component of the bar composition.

As an example, US Patent Application Publication No. 2007004611 is a cleaning or detergent soap bar for the body, also known as "soap noodles", which contains SME as the first surfactant. The composition suitable for use is disclosed. The composition also comprises a second surfactant such as sulfosuccinate and alkyl sulphate. However, the disclosed compositions include soaps, preferably tallow and / or coconut soaps, as the main components. In this publication, the composition is a precursor cleaning with improved hardness, improved scratch resistance, reduced wear rate and reduced mash formed during consumer use. Alternatively, it is also described as a laundry bar. This publication does not disclose any improved moisturizing or softening effect. This bar soap composition containing tallow and / or coconut soap is considered a combo bar composition. The publication also states that synthetic detergents are often made with mild surfactants that have low physical properties and are difficult to manufacture.

There is no prior art that discloses a specific synthetic solid detergent composition containing a long carbon chain SME as an essential ingredient capable of producing a synthetic solid detergent having a cleansing performance equivalent to that of an improved softening effect. Therefore, an improved SME-based synthetic solid detergent composition is desirable.

One of the objects of the present invention is as an essential ingredient in providing a natural and mild cleansing product with an improved emollient effect, which is useful as a cleansing and skin care product for body cleaning, washing or dishwashing. It is to provide a synthetic solid detergent composition containing SME.

It is an object of the present invention to provide an SME-based synthetic solid detergent composition that provides cleansing performance equivalent to an improved softening effect as compared to a sodium cocoyl isetionate-based synthetic solid detergent. SME-based synthetic detergent compositions should be low in manufacturing cost and cost effective for consumers.

At least one of the aforementioned objectives is met in whole or in part by the present invention. One embodiment of the present invention is a synthetic solid detergent or synthetic solid detergent composition, which comprises a fatty acid SME having a chain length of 16 to 18 carbon atoms (C16 to C18) and an alkyl sulfosuccinate. A co-surfactant selected from the group consisting of alkyl sulfates, alkyl ether sulfates, or a combination thereof, fatty alcohols selected from the group consisting of cetyl alcohol, stearyl alcohol, or cetostearyl alcohol, saturated fatty acids, and Synthetic solid detergent or synthetic solid detergent composition containing a filler and a humectant / moisturiser, wherein the SME is present in an amount of 5% to 30% by weight based on the weight of the composition. It is a thing.

As used herein, the following terms have the following meanings assigned to them as anionic surfactants.

"Alkali sulfosuccinate" is a sulfosuccinate-type anionic surfactant containing a sulfosuccinate having ^{the formula M +} (O ₃ SCH (CO ₂ R ¹ ) CH ₂ ^{CO 2 R 2} ) ^-. Yes, M ⁺ is a cation containing an alkali metal cation such as ^{sodium Na + , R 1} is hydrogen H and R ² is alkyl, or ^{both R 1} and R ² are alkyl.

"Alkyl sulfates" refers to a functional group structure (functional group structure) R-O -SO 3 - is an organic sulfate having, R is an organic residue comprising an alkyl (organic residue).

"Alkyl ether sulfate" (AES) is a _{specific group of alkyl sulfates having the general formula RO (CH 2} CH ₂ O) _n SO ₃ M, with an R of 8-18. Represents an alkyl group having a carbon atom of, n represents an average addition molar number such as about 2-10, M represents a cation that produces a water-soluble salt, which is accepted as sodium laureth sulfate (SLES). Includes compounds known by the International Naming for Cosmetic Ingredients (INCI), such as an accepted contraction of sodium laureth ether sulfate (SLES) and ammonium decyl ether sulfate.

According to a preferred embodiment of the present invention, the SME is a compound containing 55% to 99% by weight of C16SME and 45% by weight to 1% by weight of C18SME with respect to the weight of the compound.

According to another embodiment of the invention, the co-surfactant is present in an amount of 1% to 40% by weight based on the weight of the composition. According to certain embodiments, the co-surfactant is an alkyl sulfosuccinate such as lauryl disodium sulfosuccinate, an alkyl sulphate such as sodium lauryl sulphate (SLS), potassium lauryl sulphate, or a combination thereof, or lauryl. It can be an alkyl ether sulfate such as sodium ether sulfate (SLES).

Another embodiment of the invention discloses that fatty alcohols are present in an amount of 1% to 30% by weight based on the weight of the composition.

Yet another embodiment of the invention discloses that saturated fatty acids are present in an amount of 1% to 30% by weight based on the weight of the composition. Preferably, the saturated fatty acid can be stearic acid, palmitic acid, lauric acid, or any combination of two or more thereof.

Another embodiment of the invention discloses that the filler is present in an amount of 1% to 40% by weight based on the weight of the composition. In certain embodiments, the filler is wheat starch, cornstarch, rice starch, barley starch, oats, tapioca, talcum, sodium sulfate, or any combination of two or more thereof.

According to embodiments of the present invention, the moisturizer (humectant / moisturiser) is present in an amount of 1% to 10% by weight based on the weight of the composition. Preferably, the moisturizer is glycerin, water, urea, sodium lactate, or any combination of two or more thereof. For convenience, water is grouped here, but it is rather a solvent and is added to make the formulation 100%.

A further embodiment of the present invention discloses that the synthetic solid detergent composition further comprises an amount of 1% to 15% by weight of the anti-cracking agent based on the weight of the composition. For example, the anti-cracking agent can be hydrogenated vegetable oil, polyethylene glycol, or a combination thereof.

Preferred embodiments of the present invention consist of a combination of novel features and configurations that are well described or illustrated in the accompanying drawings and are particularly noted in the appended claims, with various changes in detail to the present invention. It will be appreciated that it can be provided by one of ordinary skill in the art without departing from the scope of the invention or sacrificing any of the advantages of the present invention.

Hereinafter, the present invention will be described according to a preferred embodiment of the present invention with reference to the accompanying description and drawings. However, limiting the description to preferred embodiments and drawings of the invention merely facilitates the discussion of the invention and allows one of ordinary skill in the art to make various modifications without departing from the appended claims. Please understand that it is assumed that you can come up with.

The present invention is selected from the group consisting of SMEs of fatty acids having a chain length of 16 to 18 carbon atoms (C16 to C18), alkyl sulfosuccinates, alkyl sulfates, alkyl ether sulfates, or combinations thereof. A solid containing a co-surfactant, a fatty alcohol selected from the group consisting of cetyl alcohols, stearyl alcohols or cetostearyl alcohols, saturated fatty acids, fillers and moisturizers (humectant / moisturiser). The detergent composition is disclosed. Here, SME is present in an amount of 5% to 30% by weight based on the weight of the composition.

SMEs are used in synthetic solid detergent compositions as surfactants that provide not only detergency but also beneficial effects on the skin, such as natural, mild and emollient effects. Here, the term "surface active agent" or "surface active agent system" refers to surface tension or interfacial tension between a liquid and a gas, or between two liquids, or between a liquid and a solid. Refers to one or more compounds that can reduce tension). Therefore, surfactants are useful as wetting agents, emulsifiers, or detergents.

According to one embodiment of the present invention, the SME used in the synthetic solid detergent composition is a long carbon chain SME of a fatty acid having a chain length of 16 to 18 carbon atoms (ie, C16-C18SME). .. C16SME and C18SME have the molecular structures represented by the following formulas (I) and (II), respectively.

Both C16 and C18SME can be derived from natural resources such as plant oils (vegetable oils) and animal fats, including palm oil. Specifically, C16SME can be obtained from palmitic acid. On the other hand, C18SME can be obtained from stearic acid in palm oil. Both of these SMEs were obtained by sulfonated methyl ester.

As mentioned above, SME is present in the synthetic detergent composition in an amount of about 5% to 30% by weight based on the weight of the composition. For example, it can be present in an amount of 5% to 25% by weight, or 10% to 25% by weight, or 15% to 20% by weight, based on the weight of the composition.

In certain embodiments, the SME used in the synthetic detergent composition is a compound (blend or mixture) containing C16SME and C18SME in a particular combination ratio. Preferably, the SME compound of the present invention can contain from about 55% to 99% by weight C16SME and from about 1% to 45% by weight C18SME to the weight of the compound. For example, the SME compound may be a blend of 60% to 90% by weight C16SME and 10% to 40% by weight C18SME, or a blend of 65% to 85% by weight C16SME and 15% to 35% by weight C18SME. Can be. Alternatively, the SME compound can be a blend of 90% to 99% by weight C16SME and 1% to 10% by weight C18SME.

In addition to having SME as the primary surfactant, the synthetic solid detergent compositions of the present invention can also be present in an amount of about 1% to 40% by weight based on the weight of the composition. Contains a co-surfactant. In certain embodiments, the co-surfactant is an alkyl sulfosuccinic acid such as lauryl disodium sulfosuccinate, or an alkyl sulphate such as SLS, potassium lauryl sulphate, or a combination thereof, or an alkyl ether sulphate such as SLES. Or it can be an alkyl polyglycoside. Without wishing to be bound by theory, in the presence of co-surfactants, SMEs are expected to produce a synergistic effect on the detergency of synthetic solid detergents. Understand that when SLES is added, it should be used in small amounts (eg 2-3% by weight by weight of the composition) to prevent unwanted properties of the synthetic detergents produced. I want to be. Here, to prevent the undesired properties of the solid detergent is, for example, to suppress the oiliness and stickiness when the solid agent (bar) is used.

The co-surfactant is added to the composition to provide good detergency and foaming. In certain embodiments, the combination of major surfactant and co-surfactant can also reduce skin irritation. For example, the addition of an environmentally friendly surfactant (green surfactant) such as alkyl polyglycosides (APG) to the linear alkylbenzene sulfonate (LAS) can reduce the irritation of LAS. Alternatively, a combination of APG and SLES in a particular ratio can also reduce the stimulation of SLES.

According to another embodiment of the invention, the synthetic solid detergent composition also contains a fatty alcohol present in an amount of about 1% to 30% by weight based on the weight of the composition. For example, fatty alcohols can be present in an amount of 5% to 20% by weight based on the weight of the composition. As mentioned above, the fatty alcohol used in the present invention can be cetyl alcohol, stearyl alcohol, or cetostearyl alcohol (ie, a mixture of cetyl alcohol and stearyl alcohol). Fatty alcohols serve as structurants and emollients in synthetic detergent compositions. Since fatty alcohol also functions as an anti-cracking agent, the combination of fatty alcohol (such as cetostearyl alcohol) and SME can provide an improved softening effect and anti-cracking effect on synthetic solid detergents.

Apart from fatty alcohols, the synthetic solid detergent compositions of the present invention also contain saturated fatty acids, which also serve as structuring and emollients that enhance the role of fatty alcohols. In certain embodiments, the inclusion of long chain fatty acids can also help cure the synthetic bar detergent. Preferably, the saturated fatty acids are present in an amount of about 1% to 30% by weight based on the weight of the composition. According to one embodiment of the invention, the saturated fatty acids can be stearic acid, palmitic acid, lauric acid, or any combination of two or more thereof. One of the preferred saturated fatty acids that can be used in synthetic detergent compositions is triple pressed stearic acid. In certain embodiments, triple pressed stearic acid can be present in an amount of 5% to 20% by weight based on the weight of the composition.

According to another embodiment of the invention, the synthetic solid detergent composition also comprises a filler. The filler can be present in an amount of about 1% to 40% by weight based on the weight of the composition. Specifically, the filler can be present in an amount of 10% to 30% by weight based on the weight of the composition. In certain embodiments, the filler is wheat starch, corn starch, rice starch, barley starch, oat, tapioca, talcum, sodium sulfate, or any two or more of them. It is a combination.

According to another embodiment of the invention, the moisturizer (humectant / moisturiser) is present in an amount of about 1% to 10% by weight based on the weight of the composition. For example, the moisturizer can be present in an amount of about 1% to 10% by weight based on the weight of the composition. Preferably, the moisturizer is glycerin, water, urea, sodium lactate, or any combination of two or more thereof. Moisturizers such as glycerin and water also function as binders to cohesively bind the constituents of synthetic solid detergent compositions to form soap bars.

A further embodiment of the present invention discloses that the synthetic solid detergent composition further comprises an amount of 1% to 15% by weight of the anti-cracking agent based on the weight of the composition. For example, the anti-cracking agent can be hydrogenated vegetable oil, polyethylene glycol, or a combination thereof. Preferably, the anti-cracking agent can be hydrogenated castor oil. Synthetic solid detergents can be difficult to mold. To increase the hardness of synthetic detergents for a variety of applications, the weight percent of hydrogenated vegetable oils can be increased.

The combination of ingredients does not require adjustment of the di-salt content, but a particular formulation and a particular blend of ingredients can provide a hard bar soap. The synthetic bar detergent of the present invention is substantially free of soap components and produces mild, creamy foam. Therefore, it is suitable for use by consumers as a solid cleansing agent for the body. In addition, since it has a low pH and is mild to the skin, it can also be used as a cleansing agent for animals (pets, etc.). In certain embodiments, additional ingredients such as antibacterial agents and cysteine can be added to the animal cleansing product. It can also be used for industrial or household use for washing, dishwashing, or hard surface cleaning.

In certain embodiments of the invention, the synthetic solid detergent composition can further include preservatives, stabilizers, fragrances, colorants, or any combination of two or more thereof. As a solid cleansing agent for the body that also provides skin care effects, synthetic solid detergent compositions include skin conditioning agents, skin moisturizing agents, skin hydrating agents, and oil-controlling agents. , Soothing agents or additives such as whitening agents can be further included.

According to another embodiment of the invention, the synthetic solid detergent composition provides nutritional components such as vitamins and minerals, naturally occurring essential oils, bioflavonoids and antioxidants that protect the skin from dryness due to the cleaning effect. It can also be included, which can protect the skin from external damage by leaving a protective layer on the skin and improve the overall hygiene and health of the skin. For example, vitamins and minerals can be vitamin E (tocotrienols, tocopherols, or a combination thereof), vitamin A, silica, magnesium, calcium, potassium, zinc, copper, selenium, chromium and sulfur. In certain embodiments, titanium dioxide can be added to enhance the whiteness of the synthetic solid detergent and provide the solid agent with a uniform color appearance.

Synthetic solid detergent compositions can be prepared in the form of solid bar soaps, or other suitable solid forms such as soap pellets and soap flakes. An exemplary formulation of this SME-based synthetic bar detergent will be further detailed in the Examples. Synthetic solid detergents can be made from a variety of ingredients by simply mixing powder and liquid ingredients. This process involves mixing the liquid components in a cold process. Liquid components include moisturizers (such as glycerin and water) and polyethylene glycol. Following this, solid components including SMEs, co-surfactants, fatty alcohols, saturated fatty acids and fillers are melted at high temperatures. The hot liquid of the molten component and the cold liquid from the cold process can be mixed at high temperature with a screw mixing unit to form a paste, which can be subjected to a flaking process with a cold drum. The resulting flakes can be packed to form a bar of soap.

The performance of SME-based synthetic bar detergents can be tested against commercially available synthetic bar soaps or combo soaps. Examples of comparative tests, i.e. F-test and T-test regarding the performance of bar soap, will be described in more detail in Example 2. As shown in the comparative data of Tables 4 and 5, the SME-based synthetic solid detergents have the same cleansing properties as the commercially available synthetic solid detergents and the commercially available sodium lauroyl cetioate-based combo soaps, but these commercially available synthetic solid detergents. It provides an improved softening effect compared to bar soap. Experimental data can show that the synthetic solid detergents of the present invention are mild and mild. There is no feeling of dryness of the skin after using or washing the synthetic solid detergent, and the stratum corneum (the uppermost layer of the skin) is intact. Without wishing to be bound by theory, it is believed that the combination of active ingredients in synthetic detergents can help the stratum corneum retain water and thus exhibit a emollient effect on the skin.

Example 1 Formulation of solid detergent The SME-based solid detergent can be prepared based on the formulations shown in Tables 1 to 3.

Example 2 F-test and T-test of synthetic solid detergent formulation A statistical test including F-test and T-test was performed to evaluate the performance of the SME-based synthetic solid detergent composition. The SME synthetic solid detergent prepared based on the formulation in Table 1 is compared with a commercially available synthetic solid detergent (mainly composed of sodium lauryl sulfosuccinate) and combo soap (mainly composed of sodium lauryl sethionate). Used as a test sample. Neither commercially available synthetic bar detergents nor combo soaps contain SME. These test samples were evaluated based on soap performance parameters such as rinseability, smoothness, softening, lubricity, and foaming. Specifically, all subjects (ie, participants who participated in the panel test) were required to fill out a questionnaire with all these performance parameters and were asked to quantitatively evaluate the various samples. .. Table 4 shows comparative data of the F-test and T-test between the SME-based synthetic solid detergent and the commercially available synthetic solid detergent, and Table 5 shows it between the SME-based synthetic solid detergent and the commercially available combo soap.

The F-test focuses on the analysis of variance of sample data, while the T-test refers to testing the sample mean hypothesis to assess whether a set of samples is significantly different. Based on the test results shown in Tables 4 and 5, SME-based synthetic solid detergents perform as well as commercial combo soaps, while providing an improved softening effect compared to commercial synthetic solid detergents. Demonstrated to do. The results of the T-test showed that such an improvement in the softening effect was significant.

Claims (16)

Synthetic solid detergent composition
A sulfonated methyl ester of a fatty acid having a chain length of 16 to 18 carbon atoms (C16 to C18),
A co-surfactant selected from the group consisting of alkyl sulfosuccinates, alkyl sulphates, alkyl ether sulphates, or combinations thereof.
Fatty alcohols selected from the group consisting of cetyl alcohols, stearyl alcohols, or cetostearyl alcohols,
With saturated fatty acids
With filler
Contains moisturizer (a humectant / moisturiser),
A synthetic solid detergent composition in which the sulfonated methyl ester is present in an amount of 5% by weight to 30% by weight based on the weight of the composition. The sulfonated methyl ester is a compound containing 55% by weight to 99% by weight of C16 sulfonated methyl ester and 1% by weight to 45% by weight of C18 sulfonated methyl ester with respect to the weight of the compound, according to claim 1. The composition described. The composition according to claim 1 or 2, wherein the co-surfactant is present in an amount of 1% by weight to 40% by weight based on the weight of the composition. The composition according to any one of claims 1 to 3, wherein the alkyl sulfosuccinate is lauryl disodium sulfosuccinate. The composition according to any one of claims 1 to 4, wherein the alkyl sulfate is sodium lauryl sulfate, potassium lauryl sulfate, or a combination thereof. The composition according to any one of claims 1 to 5, wherein the alkyl ether sulfate is sodium lauryl ether sulfate. The composition according to any one of claims 1 to 6, wherein the fatty alcohol is present in an amount of 1% by weight to 30% by weight based on the weight of the composition. The composition according to any one of claims 1 to 7, wherein the saturated fatty acid is present in an amount of 1% by weight to 30% by weight based on the weight of the composition. The composition according to any one of claims 1 to 8, wherein the saturated fatty acid is stearic acid, palmitic acid, lauric acid, or any combination thereof. The composition according to any one of claims 1 to 9, wherein the filler is present in an amount of 1% by weight to 40% by weight based on the weight of the composition. The filler according to any one of claims 1 to 10, wherein the filler is wheat starch, corn starch, rice starch, barley starch, oats, tapioca, talcum, sodium sulfate, or any combination thereof. Composition. The composition according to any one of claims 1 to 11, wherein the moisturizer (a humectant / moisturiser) is present in an amount of 1% by weight to 10% by weight based on the weight of the composition. The composition according to any one of claims 1 to 12, wherein the moisturizer (a humectant / moisturiser) is glycerin, water, urea, sodium lactate, or any combination thereof. The composition according to any one of claims 1 to 13, wherein the composition further comprises an amount of 1% to 15% by weight of an anti-cracking agent based on the weight of the composition. The composition according to claim 14, wherein the crack inhibitor is hydrogenated vegetable oil, polyethylene glycol, or a combination thereof. The composition of claim 1, wherein the group of co-surfactants further comprises an alkyl polyglycoside for selection.